TDA5210T Infineon Technologies, TDA5210T Datasheet - Page 32

IC ASK/FSK RECEIVER P-TSSOP-28

TDA5210T

Manufacturer Part Number
TDA5210T
Description
IC ASK/FSK RECEIVER P-TSSOP-28
Manufacturer
Infineon Technologies
Datasheet

Specifications of TDA5210T

Frequency
810MHz ~ 870MHz, 400MHz ~ 440MHz
Sensitivity
-107dBm
Modulation Or Protocol
ASK, FSK
Applications
Alarm Systems, Communication Systems
Current - Receiving
4.8mA
Data Interface
PCB, Surface Mount
Antenna Connector
PCB, Surface Mount
Voltage - Supply
4.6 V ~ 5.5 V
Operating Temperature
-40°C ~ 105°C
Package / Case
28-TSSOP
Operating Temperature (min)
-40C
Operating Temperature Classification
Automotive
Product Depth (mm)
4.4mm
Product Length (mm)
9.7mm
Operating Supply Voltage (min)
4.5V
Operating Supply Voltage (typ)
5V
Operating Supply Voltage (max)
5.5V
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
SP000087156
Wireless Components
4.7 Principle of the Precharge Circuit
In case the data slicer threshold shall be generated with an external RC network
as described in Section 4.5 it is necessary to use large values for the capacitor
C attached to the SLN pin (pin 20) in order to achieve long time constants. This
results also from the fact that the choice of the value for R connected between
the SLP and SLN pins (pins 19 and 20) is limited by the 330k resistor appear-
ing in parallel to R as can be seen in Figure 4-7. Apart from this a resistor value
of 100k
in Section 4.6.1. The resulting startup time constant
In case R is chosen to be 100k
When the device is turned on this time constant dominates the time necessary
for the device to be able to demodulate data properly. In the powerdown mode
the capacitor is only discharged by leakage currents.
In order to reduce the turn-on time in the presence of large values of C a pre-
charge circuit was included in the TDA5210 as shown in the following figure.
Figure 4-10
1
1
= (R // 330k ) · C
= (100k
leads to a voltage offset of 1mv at the comparator input as described
20k
24
// 330k ) · 47nF = 77k
Principle of the precharge circuit
U2
+3.1V
R1
R1+R2=600k
23
Uc>Us
C2
U
th r es h o ld
-
4 - 11
OTA
R2
0 / 240uA
Uc<Us
+2.4V
U2<2.4V : I=240uA
U2>2.4V : I=0
I
load
and C is chosen as 47nF this leads to
-
+
20
· 47nF = 3.6ms
Uc
C
R
19
Us
Data Filter
1
can be calculated with:
Specification, May 2001
ASK/FSK Switch
Applications
TDA 5210
precharge.WMF

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